搭建一个简易的springboot-maven项目

系统管理员 2021-09-23 09:56 404阅读 0赞

使用工具——eclipse 4.11

### 文章目录 ###

*   *   *  搭建一个基础项目
         *  spring集成thymeleaf模板引擎
         *   *  前端访问静态资源
         *  设置日志级别
         *  集成mybatis
         *   *  引入分页插件pagehelper
             *   *  使用PageHelper
                 *   *  安全性
                     *  获取分页信息
                 *  使用RowBounds分页
         *  最后再发一个现在的配置文件

### 搭建一个基础项目 ###

直接用工具创建一个maven项目，得到一个纯净的maven项目  
![在这里插入图片描述][20191025150840931.png]  
pom.xml内容

之后在pom中添加一些常用依赖包，这是添加后的pom文件配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>com.ny224</groupId>
    	<artifactId>testMavenWeb</artifactId>
    	<packaging>war</packaging>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>testMavenWeb</name>
    	<url>http://maven.apache.org</url>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    	</parent>
    
    	
    	<properties>
    		
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		
    		<start-class>testMavenWeb.App</start-class>
    	</properties>
    
    	<dependencies>
    		
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>3.8.1</version>
    			<scope>test</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-tomcat</artifactId>
    			
    			<scope>provided</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.apache.tomcat.embed</groupId>
    			<artifactId>tomcat-embed-jasper</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>jstl</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-aop</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-tx</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-orm</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-jdbc</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
    			<version>1.2.3</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>net.sf.json-lib</groupId>
    			<artifactId>json-lib</artifactId>
    			<version>2.2.3</version>
    			<classifier>jdk13</classifier>
    		</dependency>	
    		
    		<dependency>
            	<groupId>org.springframework.boot</groupId>
            	<artifactId>spring-boot-devtools</artifactId>
            	<optional>true</optional>
    		</dependency>	
    
    	</dependencies>
    
    	
    	<build>
    		<finalName>testMavenWeb</finalName>
    		
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-compiler-plugin</artifactId>
    				<version>3.1</version>
    				<configuration>
    					<source>1.8</source>
    					<target>1.8</target>
    				</configuration>
    			</plugin>			
    		</plugins>
    		
            <resources>
                <resource>
                    <directory>${basedir}/src/main/resources</directory>
                    <includes>
                        <include>*</include>
                    </includes>
                </resource>
            </resources>
    	</build>
    
    </project>

现在的项目目录结构应该是这样的  
![在这里插入图片描述][20191028152636132.png]  
下面来创建上图中的application.yml，与TestController.java文件  
**application.yml：**

server:
      port: 12345 ##端口号
      servlet:
      context-path: /myTest	##url项目名
      tomcat:
        uri-encoding: UTF-8

注意该文件为路径，默认设置下，只能以这个名字（application.yml）放在这个路径下被识别。

**TestController.java：**

import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import net.sf.json.JSON;
    import net.sf.json.JSONObject;
    
    @RestController
    @EnableAutoConfiguration
    @RequestMapping("/test")
    public class TestController { 
    	//http://localhost:12345/myTest/test/testMethod
    	@RequestMapping("/testMethod")
    	public JSON testMethod() { 
    		System.out.println("12345");
    		Map res = new HashMap();
    		res.put("data", 321);
    		return JSONObject.fromObject(res);
    	}
    	//http://localhost:12345/myTest/test/testMethod2
    	@RequestMapping("/testMethod2")
    	public String testMethod2() { 
    		return "123";
    	}
    	//http://localhost:12345/myTest/test/testMethod3?param1=aaa
    	@RequestMapping("/testMethod3")
    	public String testMethod3(String param1) { 
    		System.out.println(param1);
    		return param1;
    	}
    	//http://localhost:12345/myTest/test/testMethod4?alias_name=aaa
    	@RequestMapping("/testMethod4")
    	public String testMethod4(@RequestParam(required = false, defaultValue = "default_value", value = "alias_name") String param1) { 
    		//required 是否必选； defaultValue 默认值； value 别名
    		System.out.println(param1);
    		return param1;
    	}
    	//访问页面
    	@RequestMapping("/testView")
    	public ModelAndView testView(String param1, ModelAndView model) { 
    		System.out.println(555);
    		model.addObject("p1", "pp1");
    		model.setViewName("/test/Test.html");
    		return model;
    	}
    	
    }

上面的是最基本的web项目搭建，下面开始加一些插件

### spring集成thymeleaf模板引擎 ###

引入依赖

<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>4.3.8.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>4.3.8.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
            </dependency>
    
            <dependency>
                <groupId>org.thymeleaf</groupId>
                <artifactId>thymeleaf</artifactId>
                <version>3.0.11.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.thymeleaf</groupId>
                <artifactId>thymeleaf-spring4</artifactId>
                <version>3.0.11.RELEASE</version>
            </dependency>

加入如下配置

spring:
      thymeleaf:
        prefix: classpath:/templates/	##资源文件路径
        suffix: .html
        mode: LEGACYHTML5
        encoding: UTF-8
        content-type: text/html
        cache: false

java代码

@RequestMapping("/testTemplateView")
    	public ModelAndView testTemplateView(String param1, ModelAndView model) { 
    		model.addObject("msg", "<b>AAA</b>");
    		model.setViewName("tm/Test.html"); 
    		return model;
    	}

编写Test.html  
注意目录结构  
![在这里插入图片描述][20191029111618430.png]  
Test.html

<!DOCTYPE html>
    <html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
    <head>
        <meta charset="UTF-8">
        <title>thymeleaf</title>
    </head>
    <body>
    <h1 th:text="${msg}"></h1><div>
    [[${msg}]]___[(${msg})]
    </body>
        <script th:inline="javascript"> var str = '<sfsdf [[${msg}]]>'; var str2 = "<sfsdf [(${msg})]>"; </script>
    </html>

在经过thymeleaf渲染后，实际输出的文档源代码为

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>thymeleaf</title>
    </head>
    <body>
    <h1><b>AAA</b></h1><div>
    <b>AAA</b>___<b>AAA</b>
    </body>
        <script>
        	var str = '<sfsdf "<b>AAA<\/b>">';
        	var str2 = "<sfsdf <b>AAA</b>>";
        </script>
    </html>

页面效果  
![在这里插入图片描述][2019102911184253.png]

记录一个调试时遇到的问题：找不到资源文件，有可能是templates文件夹未加入资源文件夹中（source folders）

#### 前端访问静态资源 ####

静态资源默认的根目录是在  
/src/main/resources/static  
建一个js文件用作测试  
![在这里插入图片描述][20191030152228625.png]  
在html中，传统的写法要这样引用

注：myTest是我的项目根路径

thymeleaf是一个模板渲染引擎，可以自动获取项目根路径。url可以写成动态的。

与上面语句等效。

### 设置日志级别 ###

resources下新建application.properties文件，写入配置

logging.level.root=DEBUG
    
    logging.level.org.springframework=OFF
    logging.level.org.hibernate=OFF
    logging.level.org.mybatis=OFF
    logging.level.com.netflix=OFF
    logging.level.org.apache=OFF
    logging.level.springfox.documentation=OFF
    logging.level.com.sun.jersey=OFF

### 集成mybatis ###

mybatis官网介绍：  
[http://mybatis.org/spring/zh/index.html][http_mybatis.org_spring_zh_index.html]  
mybatis的一些配置项  
[https://mybatis.org/mybatis-3/configuration.html\#properties][https_mybatis.org_mybatis-3_configuration.html_properties]  
阿里druid数据源介绍博客  
[https://blog.csdn.net/wangmx1993328/article/details/81865153][https_blog.csdn.net_wangmx1993328_article_details_81865153]

yml中加入以下配置

spring:
      datasource:
        druid:
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://localhost:3306/blog_temp?useSSL=false
          initial-size: 1
          min-idle: 10
          max-active: 50
          max-wait: 10000
          testWhileIdle: true
          timeBetweenEvictionRunsMillis: 60000
          testOnBorrow: false
          filters: stat,wall,log4j
    mybatis:
      mapper-locations: classpath:/mapper/*/*xml
      configuration:
        log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
        jdbcTypeForNull: VARCHAR

这些基本算是最简配置。如果想自定义日志配置，可以参考一下我写的这篇文章  
[https://blog.csdn.net/nayi\_224/article/details/102841821][https_blog.csdn.net_nayi_224_article_details_102841821]

一个示例sql文件

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="testMavenWeb.com.nayi224.mapper.TestMapper">
    
        <select id="testQueryList" resultType="java.util.HashMap">
    <![CDATA[ select #{data} lv ]]>    
        </select>
        
    </mapper>

接口文件

import java.util.List;
    import java.util.Map;
    
    import org.apache.ibatis.annotations.Mapper;
    
    @Mapper
    public interface TestMapper { 
    	
    	public List<Map<String, String>> testQueryList(Map<String, String> daoMap);
    	
    }

注入实例

@Autowired
    	private TestMapper testMapper;

#### 引入分页插件pagehelper ####

mybatis配置项  
[https://mybatis.org/mybatis-3/zh/configuration.html][https_mybatis.org_mybatis-3_zh_configuration.html]  
[https://pagehelper.github.io/docs/howtouse/][https_pagehelper.github.io_docs_howtouse]

添加引用

<dependency>
    		    <groupId>com.github.pagehelper</groupId>
    		    <artifactId>pagehelper</artifactId>
    		    <version>5.1.10</version>
    		</dependency>

***注意：这里使用的版本是5.1.10，有可能与老版本的不相兼容。***

一些基础的yml配置

pagehelper:
      #helperDialect: mysql
      reasonable: true
      supportMethodsArguments: true
      #params: count=countSql

##### 使用PageHelper #####

使用PageHelper的静态方法进行分页

java代码

PageHelper.startPage(2, 5);
    		List<Map<String, String>> list1 = testMapper.testQueryList(null);
    		System.out.println("list1 : " + list1.toString());
    		System.out.println("list1 all : " + testMapper.testQueryList(null));

startPage方法的两个参数分别为页数和每页的长度

上面代码在运行后控制台输出为

Creating a new SqlSession
    SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1ab43696] was not registered for synchronization because synchronization is not active
    Cache Hit Ratio [SQL_CACHE]: 0.0
    JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@1e8bb118] will not be managed by Spring
    ==>  Preparing: WITH RECURSIVE tab1 (dt) AS (SELECT 1 UNION ALL SELECT t1.dt + 1 FROM tab1 t1 WHERE t1.dt < 20) SELECT count(0) FROM tab1 
    ==> Parameters: 
    <==    Columns: count(0)
    <==        Row: 20
    <==      Total: 1
    ==>  Preparing: with recursive tab1(dt) as ( select 1 union all select t1.dt + 1 from tab1 t1 where t1.dt < 20 ) select * from tab1 LIMIT ?, ? 
    ==> Parameters: 5(Integer), 5(Integer)
    <==    Columns: dt
    <==        Row: 6
    <==        Row: 7
    <==        Row: 8
    <==        Row: 9
    <==        Row: 10
    <==      Total: 5
    Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1ab43696]
    list1 : Page{count=true, pageNum=2, pageSize=5, startRow=5, endRow=10, total=20, pages=4, reasonable=false, pageSizeZero=false}[{dt=6}, {dt=7}, {dt=8}, {dt=9}, {dt=10}]
    Creating a new SqlSession
    SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@3ba6c3e2] was not registered for synchronization because synchronization is not active
    JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@1e8bb118] will not be managed by Spring
    ==>  Preparing: with recursive tab1(dt) as ( select 1 union all select t1.dt + 1 from tab1 t1 where t1.dt < 20 ) select * from tab1 
    ==> Parameters: 
    <==    Columns: dt
    <==        Row: 1
    <==        Row: 2
    <==        Row: 3
    <==        Row: 4
    <==        Row: 5
    <==        Row: 6
    <==        Row: 7
    <==        Row: 8
    <==        Row: 9
    <==        Row: 10
    <==        Row: 11
    <==        Row: 12
    <==        Row: 13
    <==        Row: 14
    <==        Row: 15
    <==        Row: 16
    <==        Row: 17
    <==        Row: 18
    <==        Row: 19
    <==        Row: 20
    <==      Total: 20
    Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@3ba6c3e2]
    list1 all : [{dt=1}, {dt=2}, {dt=3}, {dt=4}, {dt=5}, {dt=6}, {dt=7}, {dt=8}, {dt=9}, {dt=10}, {dt=11}, {dt=12}, {dt=13}, {dt=14}, {dt=15}, {dt=16}, {dt=17}, {dt=18}, {dt=19}, {dt=20}]

> 在你需要进行分页的 MyBatis 查询方法前调用 PageHelper.startPage 静态方法即可，紧跟在这个方法后的第一个MyBatis 查询方法会被进行分页。

可以看出是先对sql进行了改写，查出了count，之后再进行语句的。处理大数据量时要远优于将数据全查出的物理分页。

###### 安全性 ######

在对PageHelper.startPage进行设置后，紧跟着的查询语句会被分页处理，这是基于`ThreadLocal`实现的，也就是说，在特定情况下会出现异常。

例如下面这种代码

PageHelper.startPage(1, 10);
    List<Country> list;
    if(param1 != null){ 
        list = countryMapper.selectIf(param1);
    } else { 
        list = new ArrayList<Country>();
    }

存在分页设置无法被消费的情况，这可能会导致出现莫名其妙的分页。建议对查询方法进行一定的封装后再使用。

###### 获取分页信息 ######

回过头开看之前打出的日志，返回的list的输出结果为

list1 : Page{count=true, pageNum=2, pageSize=5, startRow=5, endRow=10, total=20, pages=4, reasonable=false, pageSizeZero=false}[{dt=6}, {dt=7}, {dt=8}, {dt=9}, {dt=10}]

基本可以猜得到，mybatis框架对结果集进行了封装。它的实际返回类型为`com.github.pagehelper.Page` ，是一个继承了ArrayList的封装类。

如果想获取具体的分页信息，需要转型，比如获取数据总数的话

List<Map<String, String>> list1 = testMapper.testQueryList(null);
    		System.out.println(((com.github.pagehelper.Page)list1).getTotal());

##### 使用RowBounds分页 #####

List<Map<String, String>> list1 = testMapper.testQueryList(null, new RowBounds(1, 10));
    		System.out.println("list1 : " + list1.toString());

### 最后再发一个现在的配置文件 ###

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>com.ny224</groupId>
    	<artifactId>testMavenWeb</artifactId>
    	<packaging>war</packaging>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>testMavenWeb</name>
    	<url>http://maven.apache.org</url>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    	</parent>
    
    	
    	<properties>
    		
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		
    		<start-class>testMavenWeb.App</start-class>
    	</properties>
    
    	<dependencies>
    		
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>3.8.1</version>
    			<scope>test</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-tomcat</artifactId>
    			
    			<scope>provided</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.apache.tomcat.embed</groupId>
    			<artifactId>tomcat-embed-jasper</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>jstl</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-aop</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-tx</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-orm</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-jdbc</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
    			<version>1.2.3</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>net.sf.json-lib</groupId>
    			<artifactId>json-lib</artifactId>
    			<version>2.2.3</version>
    			<classifier>jdk13</classifier>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-devtools</artifactId>
    			<optional>true</optional>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-web</artifactId>
    			<version>4.3.8.RELEASE</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-webmvc</artifactId>
    			<version>4.3.8.RELEASE</version>
    		</dependency>
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>javax.servlet-api</artifactId>
    			<version>3.1.0</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.thymeleaf</groupId>
    			<artifactId>thymeleaf</artifactId>
    			<version>3.0.11.RELEASE</version>
    		</dependency>
    		<dependency>
    			<groupId>org.thymeleaf</groupId>
    			<artifactId>thymeleaf-spring4</artifactId>
    			<version>3.0.11.RELEASE</version>
    		</dependency>
    
    
    
    		<dependency>
    			<groupId>log4j</groupId>
    			<artifactId>log4j</artifactId>
    			<version>1.2.17</version>
    		</dependency>
    
    
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>druid-spring-boot-starter</artifactId>
    			<version>1.1.10</version>
    		</dependency>
    		<dependency>
    			<groupId>org.mybatis.spring.boot</groupId>
    			<artifactId>mybatis-spring-boot-starter</artifactId>
    			<version>1.3.2</version>
    		</dependency>
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<scope>runtime</scope>
    		</dependency>
    		<dependency>
    			<groupId>com.oracle</groupId>
    			<artifactId>ojdbc14</artifactId>
    			<version>10.2.0.1.0</version>
    		</dependency>
    		
    		<dependency>
    		    <groupId>com.github.pagehelper</groupId>
    		    <artifactId>pagehelper</artifactId>
    		    <version>5.1.10</version>
    		</dependency>		
    
    	</dependencies>
    
    	
    	<build>
    		<finalName>testMavenWeb</finalName>
    		
    		
    		
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    				
    			</plugin>
    
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-compiler-plugin</artifactId>
    				<version>3.1</version>
    				<configuration>
    					<source>1.8</source>
    					<target>1.8</target>
    				</configuration>
    			</plugin>
    
    		</plugins>
    		
    		<resources>
    			<resource>
    				<directory>${basedir}/src/main/resources</directory>
    			</resource>
    		</resources>
    	</build>
    
    </project>

yml

server:
      port: 12345 ##端口
      servlet:
      context-path: /myTest	##url项目名
      tomcat:
        uri-encoding: UTF-8
    
    spring:
      thymeleaf:
        prefix: classpath:/templates/
        suffix: .html
        mode: LEGACYHTML5
        encoding: UTF-8
        content-type: text/html
        cache: false
      datasource:
        druid:
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://localhost:3306/blog_temp?useSSL=false
          initial-size: 1
          min-idle: 10
          max-active: 50
          max-wait: 10000
          testWhileIdle: true
          timeBetweenEvictionRunsMillis: 60000
          testOnBorrow: false
          filters: stat,wall,log4j
    mybatis:
      mapper-locations: classpath:/mapper/*/*xml
      config-location: classpath:mybatis/mybatis-config.xml
      #configuration:
        #log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
        #log-impl: org.apache.ibatis.logging.log4j.Log4jImpl
        #log-impl: testMavenWeb.log.CustomLog
        #jdbcTypeForNull: VARCHAR
    
    pagehelper:
      #helperDialect: mysql
      reasonable: true
      supportMethodsArguments: true
      #params: count=countSql

web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
        <display-name>web</display-name>
        
        <welcome-file-list>
            <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
        121212dsfd
        
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        </servlet>
    
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        
        <filter>
            <filter-name>CharacterEncodingFilter</filter-name>
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
            <init-param>
                <param-name>encoding</param-name>
                <param-value>utf-8</param-value>
            </init-param>
            <init-param>
                <param-name>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
        <filter-mapping>
            <filter-name>CharacterEncodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
        
    	<listener>
    		<listener-class>
    			org.springframework.web.util.Log4jConfigListener
    		</listener-class>
    	</listener>
    	<context-param>
    		<param-name>log4jConfigLocation</param-name>
    		<param-value>classpath:log4j.xml</param-value>
    	</context-param>    
    
    </web-app>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
    	<settings>
    		<setting name="jdbcTypeForNull" value="VARCHAR" />
    		<setting name="logImpl" value="testMavenWeb.log.CustomLog" />
    	</settings>
    	<plugins>
    		
    		<plugin interceptor="com.github.pagehelper.PageInterceptor">
    			
    		</plugin>
    	</plugins>
    </configuration>

import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.context.annotation.ImportResource;
    
    @SpringBootApplication
    @ImportResource(locations={ "classpath:spring.xml"})
    public class App { 
    	
    	public static void main(String[] args) { 
    		SpringApplication.run(App.class, args);
    	}
    
    }

[20191025150840931.png]: /images/20210923/78a9d474340443329182ffe07937733e.png
[20191028152636132.png]: /images/20210923/bda5344f21fd48b89a107908af91d3af.png
[20191029111618430.png]: /images/20210923/7a07c75e45844a2392ad67b6109e1f2e.png
[2019102911184253.png]: /images/20210923/4216dcc73d284ab6aa6ca62f05fb0ed2.png
[20191030152228625.png]: /images/20210923/0eafe661c4b640b38e9cef1ac9f0dbf5.png
[http_mybatis.org_spring_zh_index.html]: http://mybatis.org/spring/zh/index.html
[https_mybatis.org_mybatis-3_configuration.html_properties]: https://mybatis.org/mybatis-3/configuration.html#properties
[https_blog.csdn.net_wangmx1993328_article_details_81865153]: https://blog.csdn.net/wangmx1993328/article/details/81865153
[https_blog.csdn.net_nayi_224_article_details_102841821]: https://blog.csdn.net/nayi_224/article/details/102841821
[https_mybatis.org_mybatis-3_zh_configuration.html]: https://mybatis.org/mybatis-3/zh/configuration.html
[https_pagehelper.github.io_docs_howtouse]: https://pagehelper.github.io/docs/howtouse/